2 * Copyright (C) 2010-2011 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 (* Minimum surplus before we create an extra partition. *)
26 let min_extra_partition = 10L *^ 1024L *^ 1024L
28 (* Command line argument parsing. *)
29 let prog = Filename.basename Sys.executable_name
31 let infile, outfile, copy_boot_loader, debug, deletes, dryrun,
32 expand, expand_content, extra_partition, format, ignores,
33 lv_expands, ntfsresize_force, output_format,
34 quiet, resizes, resizes_force, shrink =
35 let display_version () =
36 let g = new G.guestfs () in
37 let version = g#version () in
38 printf "virt-resize %Ld.%Ld.%Ld%s\n"
39 version.G.major version.G.minor version.G.release version.G.extra;
43 let add xs s = xs := s :: !xs in
45 let copy_boot_loader = ref true in
46 let debug = ref false in
47 let deletes = ref [] in
48 let dryrun = ref false in
49 let expand = ref "" in
51 if s = "" then error "%s: empty --expand option" prog
52 else if !expand <> "" then error "--expand option given twice"
55 let expand_content = ref true in
56 let extra_partition = ref true in
57 let format = ref "" in
58 let ignores = ref [] in
59 let lv_expands = ref [] in
60 let ntfsresize_force = ref false in
61 let output_format = ref "" in
62 let quiet = ref false in
63 let resizes = ref [] in
64 let resizes_force = ref [] in
65 let shrink = ref "" in
67 if s = "" then error "empty --shrink option"
68 else if !shrink <> "" then error "--shrink option given twice"
72 let argspec = Arg.align [
73 "--no-copy-boot-loader", Arg.Clear copy_boot_loader, " Don't copy boot loader";
74 "-d", Arg.Set debug, " Enable debugging messages";
75 "--debug", Arg.Set debug, " -\"-";
76 "--delete", Arg.String (add deletes), "part Delete partition";
77 "--expand", Arg.String set_expand, "part Expand partition";
78 "--no-expand-content", Arg.Clear expand_content, " Don't expand content";
79 "--no-extra-partition", Arg.Clear extra_partition, " Don't create extra partition";
80 "--format", Arg.Set_string format, "format Format of input disk";
81 "--ignore", Arg.String (add ignores), "part Ignore partition";
82 "--lv-expand", Arg.String (add lv_expands), "lv Expand logical volume";
83 "--LV-expand", Arg.String (add lv_expands), "lv -\"-";
84 "--lvexpand", Arg.String (add lv_expands), "lv -\"-";
85 "--LVexpand", Arg.String (add lv_expands), "lv -\"-";
86 "-n", Arg.Set dryrun, " Don't perform changes";
87 "--dryrun", Arg.Set dryrun, " -\"-";
88 "--dry-run", Arg.Set dryrun, " -\"-";
89 "--ntfsresize-force", Arg.Set ntfsresize_force, " Force ntfsresize";
90 "--output-format", Arg.Set_string format, "format Format of output disk";
91 "-q", Arg.Set quiet, " Don't print the summary";
92 "--quiet", Arg.Set quiet, " -\"-";
93 "--resize", Arg.String (add resizes), "part=size Resize partition";
94 "--resize-force", Arg.String (add resizes_force), "part=size Forcefully resize partition";
95 "--shrink", Arg.String set_shrink, "part Shrink partition";
96 "-V", Arg.Unit display_version, " Display version and exit";
97 "--version", Arg.Unit display_version, " -\"-";
100 let anon_fun s = disks := s :: !disks in
103 %s: resize a virtual machine disk
105 A short summary of the options is given below. For detailed help please
106 read the man page virt-resize(1).
109 Arg.parse argspec anon_fun usage_msg;
111 let debug = !debug in
113 eprintf "command line:";
114 List.iter (eprintf " %s") (Array.to_list Sys.argv);
118 (* Dereference the rest of the args. *)
119 let copy_boot_loader = !copy_boot_loader in
120 let deletes = List.rev !deletes in
121 let dryrun = !dryrun in
122 let expand = match !expand with "" -> None | str -> Some str in
123 let expand_content = !expand_content in
124 let extra_partition = !extra_partition in
125 let format = match !format with "" -> None | str -> Some str in
126 let ignores = List.rev !ignores in
127 let lv_expands = List.rev !lv_expands in
128 let ntfsresize_force = !ntfsresize_force in
129 let output_format = match !output_format with "" -> None | str -> Some str in
130 let quiet = !quiet in
131 let resizes = List.rev !resizes in
132 let resizes_force = List.rev !resizes_force in
133 let shrink = match !shrink with "" -> None | str -> Some str in
135 (* Verify we got exactly 2 disks. *)
136 let infile, outfile =
137 match List.rev !disks with
138 | [infile; outfile] -> infile, outfile
140 error "usage is: %s [--options] indisk outdisk" prog in
142 infile, outfile, copy_boot_loader, debug, deletes, dryrun,
143 expand, expand_content, extra_partition, format, ignores,
144 lv_expands, ntfsresize_force, output_format,
145 quiet, resizes, resizes_force, shrink
147 (* Default to true, since NTFS and btrfs support are usually available. *)
148 let ntfs_available = ref true
149 let btrfs_available = ref true
151 (* Add in and out disks to the handle and launch. *)
152 let connect_both_disks () =
153 let g = new G.guestfs () in
154 if debug then g#set_trace true;
155 g#add_drive_opts ?format ~readonly:true infile;
156 g#add_drive_opts ?format:output_format ~readonly:false outfile;
157 if not quiet then Progress.set_up_progress_bar g;
160 (* Set the filter to /dev/sda, in case there are any rogue
161 * PVs lying around on the target disk.
163 g#lvm_set_filter [|"/dev/sda"|];
165 (* Update features available in the daemon. *)
166 ntfs_available := feature_available g [|"ntfsprogs"; "ntfs3g"|];
167 btrfs_available := feature_available g [|"btrfs"|];
173 printf "Examining %s ...\n%!" infile;
175 let g = connect_both_disks () in
179 (* Get the size in bytes of each disk.
181 * Originally we computed this by looking at the same of the host file,
182 * but of course this failed for qcow2 images (RHBZ#633096). The right
183 * way to do it is with g#blockdev_getsize64.
185 let sectsize, insize, outsize =
186 let sectsize = g#blockdev_getss "/dev/sdb" in
187 let insize = g#blockdev_getsize64 "/dev/sda" in
188 let outsize = g#blockdev_getsize64 "/dev/sdb" in
190 eprintf "%s size %Ld bytes\n" infile insize;
191 eprintf "%s size %Ld bytes\n" outfile outsize
193 sectsize, insize, outsize
196 (* In reality the number of sectors containing boot loader data will be
197 * less than this (although Windows 7 defaults to putting the first
198 * partition on sector 2048, and has quite a large boot loader).
200 * However make this large enough to be sure that we have copied over
201 * the boot loader. We could also do this by looking for the sector
202 * offset of the first partition.
204 * It doesn't matter if we copy too much.
208 (* Check the disks are at least as big as the bootloader. *)
210 if insize < Int64.of_int max_bootloader then
211 error "%s: file is too small to be a disk image (%Ld bytes)"
213 if outsize < Int64.of_int max_bootloader then
214 error "%s: file is too small to be a disk image (%Ld bytes)"
217 (* Build a data structure describing the source disk's partition layout. *)
219 p_name : string; (* Device name, like /dev/sda1. *)
220 p_size : int64; (* Current size of this partition. *)
221 p_part : G.partition; (* Partition data from libguestfs. *)
222 p_bootable : bool; (* Is it bootable? *)
223 p_mbr_id : int option; (* MBR ID, if it has one. *)
224 p_type : partition_content; (* Content type and content size. *)
225 mutable p_operation : partition_operation; (* What we're going to do. *)
226 mutable p_target_partnum : int; (* Partition number on target. *)
228 and partition_content =
229 | ContentUnknown (* undetermined *)
230 | ContentPV of int64 (* physical volume (size of PV) *)
231 | ContentFS of string * int64 (* mountable filesystem (FS type, FS size) *)
232 and partition_operation =
233 | OpCopy (* copy it as-is, no resizing *)
234 | OpIgnore (* ignore it (create on target, but don't
236 | OpDelete (* delete it *)
237 | OpResize of int64 (* resize it to the new size *)
239 let rec debug_partition p =
240 eprintf "%s:\n" p.p_name;
241 eprintf "\tpartition data: %ld %Ld-%Ld (%Ld bytes)\n"
242 p.p_part.G.part_num p.p_part.G.part_start p.p_part.G.part_end
243 p.p_part.G.part_size;
244 eprintf "\tbootable: %b\n" p.p_bootable;
245 eprintf "\tpartition ID: %s\n"
246 (match p.p_mbr_id with None -> "(none)" | Some i -> sprintf "0x%x" i);
247 eprintf "\tcontent: %s\n" (string_of_partition_content p.p_type)
248 and string_of_partition_content = function
249 | ContentUnknown -> "unknown data"
250 | ContentPV sz -> sprintf "LVM PV (%Ld bytes)" sz
251 | ContentFS (fs, sz) -> sprintf "filesystem %s (%Ld bytes)" fs sz
252 and string_of_partition_content_no_size = function
253 | ContentUnknown -> "unknown data"
254 | ContentPV _ -> sprintf "LVM PV"
255 | ContentFS (fs, _) -> sprintf "filesystem %s" fs
257 let get_partition_content =
258 let pvs_full = Array.to_list (g#pvs_full ()) in
261 let fs = g#vfs_type dev in
262 if fs = "unknown" then
264 else if fs = "LVM2_member" then (
265 let rec loop = function
267 error "%s: physical volume not returned by pvs_full"
269 | pv :: _ when canonicalize pv.G.pv_name = dev ->
270 ContentPV pv.G.pv_size
271 | _ :: pvs -> loop pvs
277 let stat = g#statvfs "/" in
278 let size = stat.G.bsize *^ stat.G.blocks in
282 G.Error _ -> ContentUnknown
284 let partitions : partition list =
285 let parts = Array.to_list (g#part_list "/dev/sda") in
287 if List.length parts = 0 then
288 error "the source disk has no partitions";
292 fun ({ G.part_num = part_num } as part) ->
293 let part_num = Int32.to_int part_num in
294 let name = sprintf "/dev/sda%d" part_num in
295 let bootable = g#part_get_bootable "/dev/sda" part_num in
297 try Some (g#part_get_mbr_id "/dev/sda" part_num)
298 with G.Error _ -> None in
299 let typ = get_partition_content name in
301 { p_name = name; p_size = part.G.part_size; p_part = part;
302 p_bootable = bootable; p_mbr_id = mbr_id; p_type = typ;
303 p_operation = OpCopy; p_target_partnum = 0 }
307 eprintf "%d partitions found\n" (List.length partitions);
308 List.iter debug_partition partitions
311 (* Check content isn't larger than partitions. If it is then
312 * something has gone wrong and we shouldn't continue. Old
313 * virt-resize didn't do these checks.
317 | { p_name = name; p_size = size; p_type = ContentPV pv_size }
318 when size < pv_size ->
319 error "%s: partition size %Ld < physical volume size %Ld"
321 | { p_name = name; p_size = size; p_type = ContentFS (_, fs_size) }
322 when size < fs_size ->
323 error "%s: partition size %Ld < filesystem size %Ld"
328 (* Check partitions don't overlap. *)
329 let rec loop end_of_prev = function
331 | { p_name = name; p_part = { G.part_start = part_start } } :: _
332 when end_of_prev > part_start ->
333 error "%s: this partition overlaps the previous one" name
334 | { p_part = { G.part_end = part_end } } :: parts -> loop part_end parts
340 (* Build a data structure describing LVs on the source disk.
341 * This is only used if the user gave the --lv-expand option.
345 lv_type : logvol_content;
346 mutable lv_operation : logvol_operation
348 and logvol_content = partition_content (* except ContentPV cannot occur *)
349 and logvol_operation =
350 | LVOpNone (* nothing *)
351 | LVOpExpand (* expand it *)
353 let debug_logvol lv =
354 eprintf "%s:\n" lv.lv_name;
355 eprintf "\tcontent: %s\n" (string_of_partition_content lv.lv_type)
358 let lvs = Array.to_list (g#lvs ()) in
362 let typ = get_partition_content name in
363 assert (match typ with ContentPV _ -> false | _ -> true);
365 { lv_name = name; lv_type = typ; lv_operation = LVOpNone }
369 eprintf "%d logical volumes found\n" (List.length lvs);
370 List.iter debug_logvol lvs
375 (* These functions tell us if we know how to expand the content of
376 * a particular partition or LV, and what method to use.
378 type expand_content_method =
379 | PVResize | Resize2fs | NTFSResize | BtrfsFilesystemResize
381 let string_of_expand_content_method = function
382 | PVResize -> "pvresize"
383 | Resize2fs -> "resize2fs"
384 | NTFSResize -> "ntfsresize"
385 | BtrfsFilesystemResize -> "btrfs-filesystem-resize"
387 let can_expand_content =
388 if expand_content then
390 | ContentUnknown -> false
391 | ContentPV _ -> true
392 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> true
393 | ContentFS (("ntfs"), _) when !ntfs_available -> true
394 | ContentFS (("btrfs"), _) when !btrfs_available -> true
395 | ContentFS (_, _) -> false
399 let expand_content_method =
400 if expand_content then
402 | ContentUnknown -> assert false
403 | ContentPV _ -> PVResize
404 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> Resize2fs
405 | ContentFS (("ntfs"), _) when !ntfs_available -> NTFSResize
406 | ContentFS (("btrfs"), _) when !btrfs_available -> BtrfsFilesystemResize
407 | ContentFS (_, _) -> assert false
409 fun _ -> assert false
411 (* Helper function to locate a partition given what the user might
412 * type on the command line. It also gives errors for partitions
413 * that the user has asked to be ignored or deleted.
416 let hash = Hashtbl.create 13 in
417 List.iter (fun ({ p_name = name } as p) -> Hashtbl.add hash name p)
421 if String.length name < 5 || String.sub name 0 5 <> "/dev/" then
425 let name = canonicalize name in
428 try Hashtbl.find hash name
430 error "%s: partition not found in the source disk image (this error came from '%s' option on the command line). Try running this command: virt-filesystems --partitions --long -a %s"
431 name option infile in
433 if partition.p_operation = OpIgnore then
434 error "%s: partition already ignored, you cannot use it in '%s' option"
437 if partition.p_operation = OpDelete then
438 error "%s: partition already deleted, you cannot use it in '%s' option"
443 (* Handle --ignore option. *)
447 let p = find_partition ~option:"--ignore" dev in
448 p.p_operation <- OpIgnore
451 (* Handle --delete option. *)
455 let p = find_partition ~option:"--delete" dev in
456 p.p_operation <- OpDelete
459 (* Helper function to mark a partition for resizing. It prevents the
460 * user from trying to mark the same partition twice. If the force
461 * flag is given, then we will allow the user to shrink the partition
462 * even if we think that would destroy the content.
464 let mark_partition_for_resize ~option ?(force = false) p newsize =
465 let name = p.p_name in
466 let oldsize = p.p_size in
468 (match p.p_operation with
470 error "%s: this partition has already been marked for resizing"
472 | OpIgnore | OpDelete ->
473 (* This error should have been caught already by find_partition ... *)
474 error "%s: this partition has already been ignored or deleted"
479 (* Only do something if the size will change. *)
480 if oldsize <> newsize then (
481 let bigger = newsize > oldsize in
483 if not bigger && not force then (
484 (* Check if this contains filesystem content, and how big that is
485 * and whether we will destroy any content by shrinking this.
489 error "%s: This partition has unknown content which might be damaged by shrinking it. If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
491 | ContentPV size when size > newsize ->
492 error "%s: This partition has contains an LVM physical volume which will be damaged by shrinking it below %Ld bytes (user asked to shrink it to %Ld bytes). If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
493 name size newsize option
495 | ContentFS (fstype, size) when size > newsize ->
496 error "%s: This partition has contains a %s filesystem which will be damaged by shrinking it below %Ld bytes (user asked to shrink it to %Ld bytes). If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
497 name fstype size newsize option
501 p.p_operation <- OpResize newsize
504 (* Handle --resize and --resize-force options. *)
506 let do_resize ~option ?(force = false) arg =
507 (* Argument is "dev=size". *)
510 let i = String.index arg '=' in
511 let n = String.length arg - (i+1) in
512 if n == 0 then raise Not_found;
513 String.sub arg 0 i, String.sub arg (i+1) n
515 error "%s: missing size field in '%s' option" arg option in
517 let p = find_partition ~option dev in
519 (* Parse the size field. *)
520 let oldsize = p.p_size in
521 let newsize = parse_size oldsize sizefield in
523 if newsize <= 0L then
524 error "%s: new partition size is zero or negative" dev;
526 mark_partition_for_resize ~option ~force p newsize
529 List.iter (do_resize ~option:"--resize") resizes;
530 List.iter (do_resize ~option:"--resize-force" ~force:true) resizes_force
532 (* Helper function calculates the surplus space, given the total
533 * required so far for the current partition layout, compared to
534 * the size of the target disk. If the return value >= 0 then it's
535 * a surplus, if it is < 0 then it's a deficit.
537 let calculate_surplus () =
538 (* We need some overhead for partitioning. Worst case would be for
539 * EFI partitioning + massive per-partition alignment.
541 let nr_partitions = List.length partitions in
542 let overhead = (Int64.of_int sectsize) *^ (
543 2L *^ 64L +^ (* GPT start and end *)
544 (64L *^ (Int64.of_int (nr_partitions + 1))) (* Maximum alignment *)
546 (Int64.of_int (max_bootloader - 64 * 512)) in (* Bootloader *)
548 let required = List.fold_left (
551 match p.p_operation with
552 | OpCopy | OpIgnore -> p.p_size
554 | OpResize newsize -> newsize in
558 outsize -^ (required +^ overhead)
560 (* Handle --expand and --shrink options. *)
562 if expand <> None && shrink <> None then
563 error "you cannot use options --expand and --shrink together";
565 if expand <> None || shrink <> None then (
566 let surplus = calculate_surplus () in
569 eprintf "surplus before --expand or --shrink: %Ld\n" surplus;
575 error "You cannot use --expand when there is no surplus space to expand into. You need to make the target disk larger by at least %s."
576 (human_size (Int64.neg surplus));
578 let option = "--expand" in
579 let p = find_partition ~option dev in
580 let oldsize = p.p_size in
581 mark_partition_for_resize ~option p (oldsize +^ surplus)
587 error "You cannot use --shrink when there is no deficit (see 'deficit' in the virt-resize(1) man page).";
589 let option = "--shrink" in
590 let p = find_partition ~option dev in
591 let oldsize = p.p_size in
592 mark_partition_for_resize ~option p (oldsize +^ surplus)
596 (* Calculate the final surplus.
597 * At this point, this number must be >= 0.
600 let surplus = calculate_surplus () in
602 if surplus < 0L then (
603 let deficit = Int64.neg surplus in
604 error "There is a deficit of %Ld bytes (%s). You need to make the target disk larger by at least this amount or adjust your resizing requests."
605 deficit (human_size deficit)
610 (* Mark the --lv-expand LVs. *)
612 let hash = Hashtbl.create 13 in
613 List.iter (fun ({ lv_name = name } as lv) -> Hashtbl.add hash name lv) lvs;
618 try Hashtbl.find hash name
620 error "%s: logical volume not found in the source disk image (this error came from '--lv-expand' option on the command line). Try running this command: virt-filesystems --logical-volumes --long -a %s"
622 lv.lv_operation <- LVOpExpand
625 (* Print a summary of what we will do. *)
630 printf "**********\n\n";
631 printf "Summary of changes:\n\n";
634 fun ({ p_name = name; p_size = oldsize } as p) ->
636 match p.p_operation with
638 sprintf "%s: This partition will be left alone." name
640 sprintf "%s: This partition will be created, but the contents will be ignored (ie. not copied to the target)." name
642 sprintf "%s: This partition will be deleted." name
643 | OpResize newsize ->
644 sprintf "%s: This partition will be resized from %s to %s."
645 name (human_size oldsize) (human_size newsize) ^
646 if can_expand_content p.p_type then (
647 sprintf " The %s on %s will be expanded using the '%s' method."
648 (string_of_partition_content_no_size p.p_type)
650 (string_of_expand_content_method
651 (expand_content_method p.p_type))
654 wrap ~hanging:4 (text ^ "\n\n")
658 fun ({ lv_name = name } as lv) ->
659 match lv.lv_operation with
663 sprintf "%s: This logical volume will be expanded to maximum size."
665 if can_expand_content lv.lv_type then (
666 sprintf " The %s on %s will be expanded using the '%s' method."
667 (string_of_partition_content_no_size lv.lv_type)
669 (string_of_expand_content_method
670 (expand_content_method lv.lv_type))
673 wrap ~hanging:4 (text ^ "\n\n")
676 if surplus > 0L then (
678 sprintf "There is a surplus of %s." (human_size surplus) ^
679 if extra_partition then (
680 if surplus >= min_extra_partition then
681 sprintf " An extra partition will be created for the surplus."
683 sprintf " The surplus space is not large enough for an extra partition to be created and so it will just be ignored."
685 sprintf " The surplus space will be ignored. Run a partitioning program in the guest to partition this extra space if you want." in
690 printf "**********\n";
694 if dryrun then exit 0
696 (* Create a partition table.
698 * We *must* do this before copying the bootloader across, and copying
699 * the bootloader must be careful not to disturb this partition table
700 * (RHBZ#633766). There are two reasons for this:
702 * (1) The 'parted' library is stupid and broken. In many ways. In
703 * this particular instance the stupid and broken bit is that it
704 * overwrites the whole boot sector when initializating a partition
705 * table. (Upstream don't consider this obvious problem to be a bug).
707 * (2) GPT has a backup partition table located at the end of the disk.
708 * It's non-movable, because the primary GPT contains fixed references
709 * to both the size of the disk and the backup partition table at the
710 * end. This would be a problem for any resize that didn't either
711 * carefully move the backup GPT (and rewrite those references) or
712 * recreate the whole partition table from scratch.
715 let parttype = g#part_get_parttype "/dev/sda" in
716 if debug then eprintf "partition table type: %s\n%!" parttype;
718 (* Try hard to initialize the partition table. This might involve
719 * relaunching another handle.
722 printf "Setting up initial partition table on %s ...\n%!" outfile;
724 let last_error = ref "" in
725 let rec initialize_partition_table g attempts =
727 try g#part_init "/dev/sdb" parttype; true
728 with G.Error error -> last_error := error; false in
730 else if attempts > 0 then (
735 let g = connect_both_disks () in
736 initialize_partition_table g (attempts-1)
741 let g, ok = initialize_partition_table g 5 in
743 error "Failed to initialize the partition table on the target disk. You need to wipe or recreate the target disk and then run virt-resize again.\n\nThe underlying error was: %s" !last_error;
747 (* Copy the bootloader across.
748 * Don't disturb the partition table that we just wrote.
749 * https://secure.wikimedia.org/wikipedia/en/wiki/Master_Boot_Record
750 * https://secure.wikimedia.org/wikipedia/en/wiki/GUID_Partition_Table
753 if copy_boot_loader then (
754 let bootsect = g#pread_device "/dev/sda" 446 0L in
755 if String.length bootsect < 446 then
756 error "pread-device: short read";
757 ignore (g#pwrite_device "/dev/sdb" bootsect 0L);
760 if parttype <> "gpt" then 512L
762 (* XXX With 4K sectors does GPT just fit more entries in a
763 * sector, or does it always use 34 sectors?
767 let loader = g#pread_device "/dev/sda" max_bootloader start in
768 if String.length loader < max_bootloader then
769 error "pread-device: short read";
770 ignore (g#pwrite_device "/dev/sdb" loader start)
773 (* Repartition the target disk. *)
775 (* The first partition must start at the same position as the old
776 * first partition. Old virt-resize used to align this to 64
777 * sectors, but I suspect this is the cause of boot failures, so
780 let sectsize = Int64.of_int sectsize in
781 let start = ref ((List.hd partitions).p_part.G.part_start /^ sectsize) in
783 (* This counts the partition numbers on the target disk. *)
784 let nextpart = ref 1 in
786 let rec repartition = function
790 match p.p_operation with
791 | OpDelete -> None (* do nothing *)
792 | OpIgnore | OpCopy -> (* new partition, same size *)
793 (* Size in sectors. *)
794 let size = (p.p_size +^ sectsize -^ 1L) /^ sectsize in
795 Some (add_partition size)
796 | OpResize newsize -> (* new partition, resized *)
797 (* Size in sectors. *)
798 let size = (newsize +^ sectsize -^ 1L) /^ sectsize in
799 Some (add_partition size) in
801 (match target_partnum with
802 | None -> (* OpDelete *)
804 | Some target_partnum -> (* not OpDelete *)
805 p.p_target_partnum <- target_partnum;
807 (* Set bootable and MBR IDs *)
809 g#part_set_bootable "/dev/sdb" target_partnum true;
811 (match p.p_mbr_id with
814 g#part_set_mbr_id "/dev/sdb" target_partnum mbr_id
820 (* Add a partition, returns the partition number on the target. *)
821 and add_partition size (* in SECTORS *) =
822 let target_partnum, end_ =
823 if !nextpart <= 3 || parttype <> "msdos" then (
824 let target_partnum = !nextpart in
825 let end_ = !start +^ size -^ 1L in
826 g#part_add "/dev/sdb" "primary" !start end_;
830 if !nextpart = 4 then (
831 g#part_add "/dev/sdb" "extended" !start (-1L);
833 start := !start +^ 64L
835 let target_partnum = !nextpart in
836 let end_ = !start +^ size -^ 1L in
837 g#part_add "/dev/sdb" "logical" !start end_;
842 (* Start of next partition + alignment to 64 sectors. *)
843 start := ((end_ +^ 1L) +^ 63L) &^ (~^ 63L);
848 repartition partitions;
850 (* Create the surplus partition. *)
851 if extra_partition && surplus >= min_extra_partition then (
852 let size = outsize /^ sectsize -^ 64L -^ !start in
853 ignore (add_partition size)
856 (* Copy over the data. *)
858 let rec copy_data = function
861 | ({ p_name = source; p_target_partnum = target_partnum;
862 p_operation = (OpCopy | OpResize _) } as p) :: ps
863 when target_partnum > 0 ->
864 let oldsize = p.p_size in
866 match p.p_operation with OpResize s -> s | _ -> oldsize in
868 let copysize = if newsize < oldsize then newsize else oldsize in
870 let target = sprintf "/dev/sdb%d" target_partnum in
873 printf "Copying %s ...\n%!" source;
875 g#copy_size source target copysize;
885 (* After copying the data over we must shut down and restart the
886 * appliance in order to expand the content. The reason for this may
887 * not be obvious, but it's because otherwise we'll have duplicate VGs
888 * (the old VG(s) and the new VG(s)) which breaks LVM.
890 * The restart is only required if we're going to expand something.
895 | ({ p_operation = OpResize _ } as p) -> can_expand_content p.p_type
900 | ({ lv_operation = LVOpExpand } as lv) -> can_expand_content lv.lv_type
905 if to_be_expanded then (
910 let g = new G.guestfs () in
911 if debug then g#set_trace true;
912 g#add_drive_opts ?format:output_format ~readonly:false outfile;
913 if not quiet then Progress.set_up_progress_bar g;
916 g (* Return new handle. *)
918 else g (* Return existing handle. *)
921 if to_be_expanded then (
922 (* Helper function to expand partition or LV content. *)
923 let do_expand_content target = function
924 | PVResize -> g#pvresize target
928 | NTFSResize -> g#ntfsresize_opts ~force:ntfsresize_force target
929 | BtrfsFilesystemResize ->
930 (* Complicated ... Btrfs forces us to mount the filesystem
931 * in order to resize it.
933 assert (Array.length (g#mounts ()) = 0);
934 g#mount_options "" target "/";
935 g#btrfs_filesystem_resize "/";
939 (* Expand partition content as required. *)
942 | ({ p_operation = OpResize _ } as p) when can_expand_content p.p_type ->
943 let source = p.p_name in
944 let target = sprintf "/dev/sda%d" p.p_target_partnum in
945 let meth = expand_content_method p.p_type in
948 printf "Expanding %s%s using the '%s' method ...\n%!"
950 (if source <> target then sprintf " (now %s)" target else "")
951 (string_of_expand_content_method meth);
953 do_expand_content target meth
957 (* Expand logical volume content as required. *)
960 | ({ lv_operation = LVOpExpand } as lv) when can_expand_content lv.lv_type ->
961 let name = lv.lv_name in
962 let meth = expand_content_method lv.lv_type in
965 printf "Expanding %s using the '%s' method ...\n%!"
967 (string_of_expand_content_method meth);
969 (* First expand the LV itself to maximum size. *)
970 g#lvresize_free name 100;
972 (* Then expand the content in the LV. *)
973 do_expand_content name meth
978 (* Finished. Unmount disks and exit. *)
986 wrap "Resize operation completed with no errors. Before deleting the old disk, carefully check that the resized disk boots and works correctly.\n";